Fbank lowey



(No Model.)

I1 LOWNY. MININGr MACHINE.

om o0 I 00 1. U 5 v, r M m 1a n l w n. d QQ .MW nu P M .msm m n D I||| I W. |||l INI Il III I l Irl III d v gr I/ .l Ill- O G O 0 0 0 0 G G O G O G 0 0 O G G.. wie mi I Q u m 0&0 o o o o o 0 o 0. .0` o o G o o 0 o. o I I I I I I 0. NIN w M N. N wf I, \\I\ n /w I WM If To aZZ whom it may concern:

UNITED STATEs PATENT OFFICE.

FRANK LONRY, OF COLUMBUS, OHIO, ASSIGNOR TO THE LECHNER MANU- FACTURING COMPANY, OF SAME PLACE.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 383,061, dated May 15, 18,88..

Application tiled May 27, 1887. Serial No. 239,546. (No model.)

Be it known that I, FRANK LowRY, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Mining-Machines, of which the following is a specication, reference being had therein to the accompanying drawings.

This invention4 relates to improvements in mining-machines of that class in which use is made of a chain for driving abar carrying cutters.. In some of such machines the chain has been passed around and engaged directly with the cutter-bar, and in others the cutter-bar has not been engaged directly, but use has been made of a supplementary chain bar or shaft connected to the cutter-bar by gearing. In all the machines of this character the power has been transmitted by the chains at a disadvantage, as no provision has been made for insuring that the power should be uniformly trans# mitted to the cutterbar at all parts of its revolution. Generally use has been made of two or more chains running from a chain shaft driven by an engine forward either to the cutter-bar directly or to a supplementary shaft, as aforesaid 5 and the sprocket-wheels for both of the said chains have been so arranged as to have their teeth on the same lines relatively to the axes of the driving and of the driven shafts. As a result, it has been found that the motion vis transmitted unevenly-that is to say, in such way that there are times of greater application of power and times of less appli-l cation.

The object of this invention is to overcome this, and it is done by so arranging the chains and the sprockets that one chain shall' apply the maximum power at one part of the rotation of the revolving shafts and the other chain apply its maximum at another time.

TheV invention can be carried out in any one of numerous ways, and 'I do not wish to be limited to the construction shown.

In the drawings, Figure l is a longitudinal section of as much of a miningmachine as is necessary to embody the invention. Fig. 2 is a top plan view. Fig. 3 is a cross-section of the rear or driving-chain shaft, which gure shows, also, the relations of the teeth o1" the several sets on the front bar or shaftthat is, the one driven by the chains.

I have, for sakeof illustration, selected such parts of well-known mining-machines as are sufficient to give a full understanding of the presentinvention. For an understanding ofall of the details of a complete machine reference may be made to patent to B. A. Legg, No. 299, 655, dated June 4,1884; but I do not limit the invention to any particular form of mining-machine, as a large number are now well known, to any one of which the invention can be applied for the purpose of imparting power to the cutting mechanism.

In the drawings, A represents the powershaft-that is, a shaft that receives the power from the engine-and B the driven shaft or bar, the latter in the construction shown being the bar which directly carries the cutters. The power may be imparted to shaft A by any suitable mechanism, power devices being indicated in Fig. l, comprising a shaft, B, and gearing. (Shown in dotted lines at d cl.) Upon it are formed or to it are attached two sprocketwheels or two sets of sprocketteeth, 7 5 one being shown at a and the other at a. The shaft or bar B is formed or provided with corresponding wheels or teeth at b and b. From an examination of Fig. l it will be seen that the teeth a a are not in the same axial planes. The teeth in each set are arranged about ninety degrees apart, and those at a are respectively in longitudinal axial planes midway between the planes of the teeth a. The sets of teeth b b on the bar B are similarly arranged in relation to each other. Y

C C' represent the chains passing from the teeth at a a to those at b b', these, as shown, being lformed of links of similar character and size; and by reason ofthe above-described ar`- I rangement of 'the teeth the links of one chain are somewhat in advance of those of the other,

Vhen the parts are arranged in the way described, the power is applied to the driven shaft or bar uniformly, the times of maximum application of one chain being intermediate of the corresponding times of the other chain.

In this Way an end is reached more or less analogous to that attained by the ordinary arrangement of engines in respect to the cranlrroo shaft, by which arrangement the dead-center is overcome.

As above indicated, the same object can be reached in other ways so long as chains of substantially the character shown and described are interposed between the engine or the power devices and the cutter-bar, whether interposed directly or indirectly. In fact, the

invention can be applied even in still other said power devices and the cutter-bar, and

the teeth b b', arranged, substantially as set forth, in different axial planes, as described.

2. In a mining-machine, the combination, I

with the power devices and the cutter-bar, of the chains interposed between the power devices and the cutter-bar, and arranged, substantially as set forth, with the links of one chain out of line transversely with the links of the other chain, as described.

3. The combination, with the power devices and the chains adapted to transmit power, of the chain-driving shaft having two sets of teeth, the teeth of one set being out of the lines of the teeth of the other set, and a shaft driven by the said chain, having two sets of teeth cor respondingly out of line, substantially as de scribed.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK LOWRY,

Vitnesses: J AMEs WA'rsoN,

T. M. Lrvnsav. 

